Alternative starter motor for WR450

Just bought a bike in the UK with faulty elec start, turns out the commutator on the motor has a missing segment, and has wrecked the brush mechanism.

Yamaha want £230 for motor !

Has anyone matched a comparable alternative, from another bike, which has plentiful supply in breakers yards ?

Have made a sketch of the sizes

Gear and location diameter seem common to other Yamaha's

Happy to make adapter bracket to secure the rear mounting for it

Any suggestions folk ?

Thanks

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